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![]() The line nut should require no more than 1/8 turn with a wrench before being free enough to spin off with your fingers. The inlet line should then be removed by untorquing the AN 818-4D line nut. To remove the caliper the 1/4" bolts that hold the outer brake pad retaining plate in place must be removed. The FARs require the use of the manufacturer's current maintenance instructions, and the Grumman maintenance manual gives very little detail about the wheel and brake system. The Cleveland Wheel and Brake Maintenance Manual is available on-line. If hydraulic fluid leaks have been found at the brake caliper on either main wheel, the likely causes are worn o-ring, pitted wheel cylinder or cracked wheel cylinder casting at the inlet or bleeder fitting. ![]() This is a red petroleum-based fluid, as opposed to the Glycol based automotive fluids, and the system is not compatible with any other fluid. The hydraulic brakes use a Mil Spec fluid MIL-H-5606G, commonly referred to as "5606". Properly maintaining the brake system on Grumman American aircraft is extremely important because the brakes are the only way to steer the plane on the ground at low speeds where the rudder is ineffective.
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